How to add % symbol on a column?

Hi Deo,
 
Thank you for writing to us.
 
The desired format pattern can be achieved by specifying a format for a measure of your choice either through UI (Format -> Format Cells in Toolbar) or by setting the report configurations manually through code.
 
More specifically, you can either specify the % as a currencySymbol property of the format object, or set its isPercent value to true. However, the latter multiplies the value by 100 before displaying the percentage symbol, so the first option might be more suitable for your data format.
 
More information on these properties as well as on number formatting in general can be found here: https://www.flexmonster.com/doc/number-formatting/
 
We hope this helps.
 
Best regards,
Mykhailo